Carburetor Settings and Specifications
Specifications and stock settings for the Mikuni Carburetors found on the Suzuki Katana Motorcycle.
Note: When tuning the fuel screws start at the stock setting, or a known good position. Make changes in increments of quarter or half turns on the screws.
1988-1989
600cc
- Type BST31SS
- Main jets 1 and 4 137.5
- Main jets 2 and 3 135
- Main air jet 1.0 mm
- Jet needle (-clip position)
- California 4CZ-5-1
- Except California 4CZ-4-1
- Needle jet P-8
- Pilot jet
- California 37.5
- Except California 32.5
- Pilot air jet
- 1988
- California 155
- Except California 150
- 1988
- California 150
- Except California 155
- 1988
- Pilot "Air/Fuel" screw setting - US models 2.5 turns
- Starter jet 45
- Float height 14.6 +/-1 mm (0.57 +/- 0.04 inch)
1100cc (1988-1993)
- Type BST34SS
- Main jets
- carbs 1 and 4 - 112.5
- carbs 2 and 3 - 110
- Main air jet 0.6mm
- Jet needle
- California 5DL16
- US except California 5DL11
- UK 5DL7-3
- Needle jet
- California and UK P-0
- All other P-2
- Pilot jet
- California and UK 42.5
- All other 32.5
- Pilot air jet
- California 155
- US except California 135
- UK 150
- Pilot "Air/Fuel" screw setting
- US 2.5 Turns out
- 88-90 UK 2-7/16
- 91 on UK 2-1/2
- Float height 14.6 +/- 1mm (0.57 +/- 0.04 inch)
1990-1997
600cc
- Type BST33SS
- Main jets 112.5
- Main air jet 0.5 mm
- Jet needle
- California 5F105
- Except California 5F104
- Needle jet P-2
- Pilot jet 32.5
- Pilot air jet
- California 1.45 mm
- Except California 1.55 mm
- Starter jet 35
- Float height 14.6 +/-1 mm (0.57 +/- 0.04 inch)
- Fuel "Air/Fuel" Screws 2.5 Turns out from stop
- Type BST36SS
- Main jets
- US, cylinder no. 3 110
- All others 105
- Main air jet 0.5 mm
- Jet needle
- California 5EZ63
- US except California 5EZ62
- UK 5EZ61-3
- California 5EZ63
- Needle jet
- US Y-1
- UK Y-2
- Pilot jet
- US 32.5
- UK 37.5
- Pilot air jet
- 1989 and 1990 California 1.25 mm
- 1991 on California 1.2 mm
- US except California 1.35 mm
- UK Preset (1-5/8 turns back)
- Starter jet 37.5
- Float height 14.6 +/-1 mm (0.57 +/- 0.04 inch)
- Pilot screw setting 2.5 turns out
600
- Type BSR32SS
- Pilot jet 12.5 (N224.103)
- Jet needle
- European models (clip position) 5DH29-54 (3)
- US and Canada models 5DH30-54
- Needle jet P-0
- Main jet
- German full power Y, K1, and K2 (00-02) models 115
- All other models
- carbs 1 and 4 115
- carbs 2 and 3 112.5
- Pilot screw settings (turns out)
- Austria and Switzerland 2 5/8
- German restricted 2
- German full power
- 98-99 - 2 1/4
- 00-02 - 2
- All other Euro models 2 1/4
- Canada models 2 5/8
- US models 2.5 turns out
- Float height 13.0 +/- .5 mm
- Type BSR36SS
- Pilot jet
- Austria ans Switzerland 12.5
- All other Euro models 15
- US and Canada 12.5
- Jet needle
- Austria ans Switzerland (clip position) 5DF19-53 (3)
- All other Euro models 5DF-52 (3)
- US and Canada 5DF21-53
- Needle jet
- Euro models P-0
- US and Canada models P-0M
- Main jet
- Austria and Switzerland
- carbs 1 and 4 120
- carbs 2 and 3 117.5
- All other Euro Models 117.5
- US and Canada 117.5
- Austria and Switzerland
- Pilot screw setting (turns out)
- Austria and Switzerland 3
- All other Euro models
- carbs 1 and 4 - 2
- carbs 2 and 3 - 1 1/2
- Canada models 3
- US models 2.5
- Float heights 13.0 +/- .5mm